Secretary A will use "Sincerely" as the complimentary closing of a letter to a colleague. Secretary B will use "Cordially" as the complimentary closing of a letter to a friend. Which secretary is using the correct closing?

Question

Secretary A will use "Sincerely" as the complimentary closing of a letter to a colleague. Secretary B will use "Cordially" as the complimentary closing of a letter to a friend. Which secretary is using the correct closing?
     A. Neither secretary
     B. Both secretaries
     C. Only secretary A
     D. Only secretary B

Ms. Sue · Answer

http://www.kcitraining.com/styleguide/book/letelem.html